<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style type="text/css">
			  div{
					background-color: yellow;
					width: 200px;
					height: 200px;
					}
		</style>
	</head>
	<body>
		<!-- 行间样式优先级最高 -->
		<div style="background-color: blue;"></div>
	</body>
</html>
